5 genera are assigned to the class ARACHNIDA

Order	Genus	FOP	FOS	LOP	LOS
SCORPIONIDA	Dolichophonus	S	Ldov-u	S	Ldov-u
SCORPIONIDA	Palaeophonus	S	Wenl-l	S	Wenl-l
SCORPIONIDA	Palaeoscorpius	D	Emsi-l	D	Emsi-l
SCORPIONIDA	Proscorpius	S	Prid	S	Prid
SCORPIONIDA	Waeringscorpii	D	Emsi-l	D	Emsi-l

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FOP = Period of first occurrence
FOS = Stage of first occurrence
LOP = Period of last occurrence
LOS = Stage of last occurrence

Stage abbreviations follow Sepkoski (2002).